Process for preparing an oil suitable for impregnating porous bodies.



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Specification, an... race PatentedOct. 15.11am. Applicationfiled rune 26.1911." serial no..', srz;

To all'whom it may concern:

Be it known that 1, Jumps Dnrms'r, doctor of philosophy, chemist, a subject ofthe King of Prussia and the German Emperor,

Oils Suitable for lmpregnat-ing' Porous Bodies; and I do hereby declare the following to be a full, clear, and exact" description of the same.

I have found that by mixing coal tar with petroleum, especially crude petroleum, pitch like, resinous substances are separated, while the main portion of the mixture forms a clear oil, which may be separated by de cantation, filtration or any suitable mechanical separation process from the deposited substances. The oil is a viscous clear liquid containing the bituminous substances present in the coal tar. The pitch consists of free carbon and resin like matter. This oil is, in-a fresh state, namely as soon as possible after its production, very suitable for impregnating wood or other porous bodies.

In continued storage or after heating, however, again pitch like resinous substances are formed, whereby the use of the said-oil for impregnating. purposes is essentially in jured. I have furthermore found that one may produce a perfectly clear and stable oil, very suitable for impregnating wood by 36 heating the said oil to a suflicientlyhigh temperature and treating the heated oil with air. This treatment has the effect to cause the qu1ck, immediate, practically complete de osition of substances which without the said treatment would be formed only after a certain lapse of. time or after a heating. The temperature during the treatment of the oil with air may vary between 5.0 and 200 degrees centigrade. If the coal tar or the petroleum or both materials contain a large amount of resinous substances one must choose a higher temperature than if one employs materials of a smaller propor-' tion. If one desires to treat the mixture with'air for a short period, one must also increase the temperature during the treatment. e

As a substitute for the petroleumin the present process one may so use distillates of high boiling point, for'instance the dis: tillates' called commercially gas oil or parafiin oil, boiling between 300 and 450 oils. The coal tar'may be substituted by filtered tar,'deprived of free "carbon. One may also use the high boilin residing at 2 Auguste Victoria street, Halcnsee, near Berlin, Kingdom of Prussia, Ger- 1 man Empire, have invented a new and useful Improvement in Processes for Preparing point distlllates of tar, as naphthalene oi boiling between 180 and 250'degrees' centigrade, heavy 250 and 360 degrees centigrade. One may also use in the lace of coal tar brown coal tar (lignite tar? and the distillates from it.

Example: 1000 kilograms coal tarare mixed with 3000 vkilograms crude petroleum under gentle heating sufficient for rendering the coal tar fluid in order to secure a thor-- ough mixing. One allows the mixture to stand sufiicient time to insure a deposition of the separated pitch like orresinous substances. Then one vseparates the clear oil mixture from the separated particles, and blows air in the oil while heating to about 100 degreescentigrade during 8 hours. One

degrees centigrade. One may also use shale oil-:boiling between 200 and 275 degrees centigrade, anthracene oil boiling between allows to cool and the precipitated particles to settle and separates then the clear oil from the deposits.

The oil obtained by the present process may be used for impregnating-wood. The' wood'is exhausted and the oil is forced by pressure into the wood.

One 'may also add metallic compounds having antiseptic power to the oil. For instance one may incorporate sulfateof copper, iron, zinc, aluminum, chlorid of zinc or iron. One may also use the said compounds in the form of emulsions.

1. The process for preparing an oil suitable for impregnating porous bodies, which consists in mixing tar with petroleum, allowing the obtained preci itate consisting of free carbon and resinll esubstances to settle and separating mechanically the clear oil consisting of the hydrocarbons of the petroleum and coal tar, including the bituminous substances of the latter soluble in the said hydrocarbons, from the deposits.

2. The process for preparingb an oil suitof free carbon and resin 11 e substances to settle separating mechanically the clear oil consisting of the hydrocarbons of the petroleum and coal tar including the bituminous substances of the latter soluble -1n the said hydrocarbons, from the deposits,

blowing air into the heated separated clear oil and separating -mechanical1y the clear oil from the formed deposits.

3. The process for impregnating porous bodies which consists in mixing tar with petroleum, allowing the ."formed precipitate to settle, separating the clear oil from the deposits and introducing the obtained oil into exhausted porous bodies under pressure.

4. The process for impregnating porous bodies which consists in mixing tar with petroleum, allowing the formed precipitate to settle, separating the clear oil from the deposits, blowing air into the heated sepa-- In testimony whereof, I have signed my 20 name to this specification in the presence of two subscribing witnesses.

JULIUS DEHNST. Witnesses:

HENilY HASPER, WOLDEMAR HAUPT. 

